All you need to know about the concat operator in RxJS

concat(...observables): Observable
const ob1$ = of( 1 , 2 , 3, 4 );const ob2$ = interval( 1000 ).pipe(take( 4 ));const result = concat(ob1$, ob2$);result.subscribe(val => console.log(val));
// 1// 2// 3// 4// 0// 1// 2// 3

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